Cyr's mother Liliane last saw her 18-month-old daughter on August 15, 1978, when she left the child in the care of her then-boyfriend for several days while she was out of town for work.
When she returned, the girl was nowhere to be found. Cyr's boyfriend told her Yohanna had drowned accidentally in the bathtub and that he had buried her.
The man was questioned by police but released for lack of evidence. An American, he fled across the border, and Cyr has had no contact with him since.
Cyr says not a day goes by that she does not yearn to see her daughter. She says she has not given up hope that Yohanna might be alive.
Cyr and the RCMP say that with the release of the composite sketch, someone might recognize the woman — who would now be 36 years old.
Cyr says she is prepared to accept Yohanna might not be alive. However, she desperately wants to find out what happened to her.